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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">itemviews/pixelator/mainwindow.cpp</span>
<!-- $$$itemviews/pixelator/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include <QtGui></span>
<span class="preprocessor">#include "imagemodel.h"</span>
<span class="preprocessor">#include "mainwindow.h"</span>
<span class="preprocessor">#include "pixeldelegate.h"</span>
MainWindow<span class="operator">::</span>MainWindow()
{
currentPath <span class="operator">=</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>homePath();
model <span class="operator">=</span> <span class="keyword">new</span> ImageModel(<span class="keyword">this</span>);
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>centralWidget <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qwidget.html">QWidget</a></span>;
view <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtableview.html">QTableView</a></span>;
view<span class="operator">-</span><span class="operator">></span>setShowGrid(<span class="keyword">false</span>);
view<span class="operator">-</span><span class="operator">></span>horizontalHeader()<span class="operator">-</span><span class="operator">></span>hide();
view<span class="operator">-</span><span class="operator">></span>verticalHeader()<span class="operator">-</span><span class="operator">></span>hide();
view<span class="operator">-</span><span class="operator">></span>horizontalHeader()<span class="operator">-</span><span class="operator">></span>setMinimumSectionSize(<span class="number">1</span>);
view<span class="operator">-</span><span class="operator">></span>verticalHeader()<span class="operator">-</span><span class="operator">></span>setMinimumSectionSize(<span class="number">1</span>);
view<span class="operator">-</span><span class="operator">></span>setModel(model);
PixelDelegate <span class="operator">*</span>delegate <span class="operator">=</span> <span class="keyword">new</span> PixelDelegate(<span class="keyword">this</span>);
view<span class="operator">-</span><span class="operator">></span>setItemDelegate(delegate);
<span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>pixelSizeLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">"Pixel size:"</span>));
<span class="type"><a href="qspinbox.html">QSpinBox</a></span> <span class="operator">*</span>pixelSizeSpinBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qspinbox.html">QSpinBox</a></span>;
pixelSizeSpinBox<span class="operator">-</span><span class="operator">></span>setMinimum(<span class="number">4</span>);
pixelSizeSpinBox<span class="operator">-</span><span class="operator">></span>setMaximum(<span class="number">32</span>);
pixelSizeSpinBox<span class="operator">-</span><span class="operator">></span>setValue(<span class="number">12</span>);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&File"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>openAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Open..."</span>));
openAction<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Open);
printAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&Print..."</span>));
printAction<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
printAction<span class="operator">-</span><span class="operator">></span>setShortcut(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Print);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>quitAction <span class="operator">=</span> fileMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"E&xit"</span>));
quitAction<span class="operator">-</span><span class="operator">></span>setShortcuts(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>Quit);
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(tr(<span class="string">"&Help"</span>)<span class="operator">,</span> <span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>aboutAction <span class="operator">=</span> helpMenu<span class="operator">-</span><span class="operator">></span>addAction(tr(<span class="string">"&About"</span>));
menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(fileMenu);
menuBar()<span class="operator">-</span><span class="operator">></span>addSeparator();
menuBar()<span class="operator">-</span><span class="operator">></span>addMenu(helpMenu);
connect(openAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(chooseImage()));
connect(printAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(printImage()));
connect(quitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(quit()));
connect(aboutAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(showAboutBox()));
connect(pixelSizeSpinBox<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
delegate<span class="operator">,</span> SLOT(setPixelSize(<span class="type">int</span>)));
connect(pixelSizeSpinBox<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateView()));
<span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>controlsLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(pixelSizeLabel);
controlsLayout<span class="operator">-</span><span class="operator">></span>addWidget(pixelSizeSpinBox);
controlsLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>);
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(view);
mainLayout<span class="operator">-</span><span class="operator">></span>addLayout(controlsLayout);
centralWidget<span class="operator">-</span><span class="operator">></span>setLayout(mainLayout);
setCentralWidget(centralWidget);
setWindowTitle(tr(<span class="string">"Pixelator"</span>));
resize(<span class="number">640</span><span class="operator">,</span> <span class="number">480</span>);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>chooseImage()
{
<span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"Choose an image"</span>)<span class="operator">,</span> currentPath<span class="operator">,</span> <span class="string">"*"</span>);
<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>isEmpty())
openImage(fileName);
}
<span class="type">void</span> MainWindow<span class="operator">::</span>openImage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>fileName)
{
<span class="type"><a href="qimage.html">QImage</a></span> image;
<span class="keyword">if</span> (image<span class="operator">.</span>load(fileName)) {
model<span class="operator">-</span><span class="operator">></span>setImage(image);
<span class="keyword">if</span> (<span class="operator">!</span>fileName<span class="operator">.</span>startsWith(<span class="string">":/"</span>)) {
currentPath <span class="operator">=</span> fileName;
setWindowTitle(tr(<span class="string">"%1 - Pixelator"</span>)<span class="operator">.</span>arg(currentPath));
}
printAction<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
updateView();
}
}
<span class="type">void</span> MainWindow<span class="operator">::</span>printImage()
{
<span class="preprocessor">#ifndef QT_NO_PRINTER</span>
<span class="keyword">if</span> (model<span class="operator">-</span><span class="operator">></span>rowCount(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>())<span class="operator">*</span>model<span class="operator">-</span><span class="operator">></span>columnCount(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>())
<span class="operator">></span> <span class="number">90000</span>) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton answer;
answer <span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>question(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Large Image Size"</span>)<span class="operator">,</span>
tr(<span class="string">"The printed image may be very large. Are you sure that "</span>
<span class="string">"you want to print it?"</span>)<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Yes <span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>No);
<span class="keyword">if</span> (answer <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>No)
<span class="keyword">return</span>;
}
<span class="type"><a href="qprinter.html">QPrinter</a></span> printer(<span class="type"><a href="qprinter.html">QPrinter</a></span><span class="operator">::</span>HighResolution);
<span class="type"><a href="qprintdialog.html">QPrintDialog</a></span> <span class="operator">*</span>dlg <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprintdialog.html">QPrintDialog</a></span>(<span class="operator">&</span>printer<span class="operator">,</span> <span class="keyword">this</span>);
dlg<span class="operator">-</span><span class="operator">></span>setWindowTitle(tr(<span class="string">"Print Image"</span>));
<span class="keyword">if</span> (dlg<span class="operator">-</span><span class="operator">></span>exec() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qdialog.html">QDialog</a></span><span class="operator">::</span>Accepted)
<span class="keyword">return</span>;
<span class="type"><a href="qpainter.html">QPainter</a></span> painter;
painter<span class="operator">.</span>begin(<span class="operator">&</span>printer);
<span class="type">int</span> rows <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>rowCount(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>());
<span class="type">int</span> columns <span class="operator">=</span> model<span class="operator">-</span><span class="operator">></span>columnCount(<span class="type"><a href="qmodelindex.html">QModelIndex</a></span>());
<span class="type">int</span> sourceWidth <span class="operator">=</span> (columns<span class="operator">+</span><span class="number">1</span>) <span class="operator">*</span> ItemSize;
<span class="type">int</span> sourceHeight <span class="operator">=</span> (rows<span class="operator">+</span><span class="number">1</span>) <span class="operator">*</span> ItemSize;
painter<span class="operator">.</span>save();
<span class="type">double</span> xscale <span class="operator">=</span> printer<span class="operator">.</span>pageRect()<span class="operator">.</span>width()<span class="operator">/</span><span class="type">double</span>(sourceWidth);
<span class="type">double</span> yscale <span class="operator">=</span> printer<span class="operator">.</span>pageRect()<span class="operator">.</span>height()<span class="operator">/</span><span class="type">double</span>(sourceHeight);
<span class="type">double</span> scale <span class="operator">=</span> <a href="qtglobal.html#qMin">qMin</a>(xscale<span class="operator">,</span> yscale);
painter<span class="operator">.</span>translate(printer<span class="operator">.</span>paperRect()<span class="operator">.</span>x() <span class="operator">+</span> printer<span class="operator">.</span>pageRect()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span><span class="operator">,</span>
printer<span class="operator">.</span>paperRect()<span class="operator">.</span>y() <span class="operator">+</span> printer<span class="operator">.</span>pageRect()<span class="operator">.</span>height()<span class="operator">/</span><span class="number">2</span>);
painter<span class="operator">.</span>scale(scale<span class="operator">,</span> scale);
painter<span class="operator">.</span>translate(<span class="operator">-</span>sourceWidth<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="operator">-</span>sourceHeight<span class="operator">/</span><span class="number">2</span>);
<span class="type"><a href="qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> option;
<span class="type"><a href="qmodelindex.html">QModelIndex</a></span> parent <span class="operator">=</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span>();
<span class="type"><a href="qprogressdialog.html">QProgressDialog</a></span> progress(tr(<span class="string">"Printing..."</span>)<span class="operator">,</span> tr(<span class="string">"Cancel"</span>)<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> rows<span class="operator">,</span> <span class="keyword">this</span>);
progress<span class="operator">.</span>setWindowModality(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ApplicationModal);
<span class="type">float</span> y <span class="operator">=</span> ItemSize<span class="operator">/</span><span class="number">2</span>;
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>; row <span class="operator"><</span> rows; <span class="operator">+</span><span class="operator">+</span>row) {
progress<span class="operator">.</span>setValue(row);
qApp<span class="operator">-</span><span class="operator">></span>processEvents();
<span class="keyword">if</span> (progress<span class="operator">.</span>wasCanceled())
<span class="keyword">break</span>;
<span class="type">float</span> x <span class="operator">=</span> ItemSize<span class="operator">/</span><span class="number">2</span>;
<span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> <span class="number">0</span>; column <span class="operator"><</span> columns; <span class="operator">+</span><span class="operator">+</span>column) {
option<span class="operator">.</span>rect <span class="operator">=</span> <span class="type"><a href="qrect.html">QRect</a></span>(<span class="type">int</span>(x)<span class="operator">,</span> <span class="type">int</span>(y)<span class="operator">,</span> ItemSize<span class="operator">,</span> ItemSize);
view<span class="operator">-</span><span class="operator">></span>itemDelegate()<span class="operator">-</span><span class="operator">></span>paint(<span class="operator">&</span>painter<span class="operator">,</span> option<span class="operator">,</span>
model<span class="operator">-</span><span class="operator">></span>index(row<span class="operator">,</span> column<span class="operator">,</span> parent));
x <span class="operator">=</span> x <span class="operator">+</span> ItemSize;
}
y <span class="operator">=</span> y <span class="operator">+</span> ItemSize;
}
progress<span class="operator">.</span>setValue(rows);
painter<span class="operator">.</span>restore();
painter<span class="operator">.</span>end();
<span class="keyword">if</span> (progress<span class="operator">.</span>wasCanceled()) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Printing canceled"</span>)<span class="operator">,</span>
tr(<span class="string">"The printing process was canceled."</span>)<span class="operator">,</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
}
<span class="preprocessor">#else</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Printing canceled"</span>)<span class="operator">,</span>
tr(<span class="string">"Printing is not supported on this Qt build"</span>)<span class="operator">,</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> MainWindow<span class="operator">::</span>showAboutBox()
{
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>about(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"About the Pixelator example"</span>)<span class="operator">,</span>
tr(<span class="string">"This example demonstrates how a standard view and a custom\n"</span>
<span class="string">"delegate can be used to produce a specialized representation\n"</span>
<span class="string">"of data in a simple custom model."</span>));
}
<span class="type">void</span> MainWindow<span class="operator">::</span>updateView()
{
view<span class="operator">-</span><span class="operator">></span>resizeColumnsToContents();
view<span class="operator">-</span><span class="operator">></span>resizeRowsToContents();
}</pre>
</div>
<!-- @@@itemviews/pixelator/mainwindow.cpp -->
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